Test on Fundamentals of Yarn Spinning Technology

Question 1: The two-nozzle air-jet spinning technology is currently considered to have much more potential and produces yarn with better properties compared to the one-nozzle technology.

A. Ano

B. Ne

Explanation: The study materials state that the one-nozzle air jet technology has much more potential and produces yarn with better properties, and today it substitutes the two-nozzle technology.

Question 2: When comparing rotor spun yarn to ring spun yarn, which of the following properties are typically lower in rotor spun yarn?

A. Hairiness

B. Mean relative tenacity

C. Yarn bulk

D. Mass irregularity

Explanation: According to the study materials, rotor spun yarn has lower hairiness, lower mean relative tenacity, and lower mass irregularity compared to ring spun yarn. Conversely, rotor spun yarn has higher yarn bulk.

Question 3: The condensing zone in compact spinning is designed to increase yarn hairiness.

A. Ano

B. Ne

Explanation: Compact spinning includes an additional feature to reduce yarn hairiness in the condensing zone.

Question 4: According to the study materials, which statement correctly describes a key aspect of the twist insertion mechanism in ring spinning?

A. The ring traveller possesses its own drive, which causes it to rotate independently and insert twist into the yarn.

B. Yarn winding onto the cop is the primary mechanism for twist insertion, driven by the raising and lowering of the ring rail.

C. Each rotation of the traveller, which is dragged by the spindle through the yarn, produces a twist in the yarn.

D. The increase or decrease in twist is solely determined by the rotational speed of the spindle, independent of other components.

Explanation: The study materials state that 'Each rotation of the traveller produces a twist in the yarn' and 'The ring traveller has no drive of its own, it is dragged with spindle via the yarn attached to it.' This makes option 2 correct. Option 0 is incorrect because the traveller has no drive. Option 1 is incorrect because winding on the cop is a result of the speed difference between the spindle and traveller, not the primary twist insertion mechanism. Option 3 is incorrect because the increase or decrease in twist is mainly a result of a change in the speed of the delivery roller, not solely the spindle's speed.

Question 5: The Heavy Particle Separator utilizes a spark sensor to detect burning material.

A. Ano

B. Ne

Explanation: The study materials state that the Heavy Particle Separator's mechanisms include 'The spark sensor detects burning material'.